A widely used insult with a variety of meanings: son of a bitch, bastard... Even though this word is extremly vulgar throughout most of South America, it has a very different meaning in Mexico. Guys often use the term "cabrón" to address their good friends, without any offense at all.

Hacer de tripas corazón

To make an effort to do something you don’t like/to be brave

Literally, to make your guts into heart. E.g. No me gusta volar, pero hice de tripas corazon para ir a Tailandia en avión para la luna de miel = I don’t like flying, but I made an effort to go to Thailand by plane for our honeymoon.